Bluetooth Audio Receiver: Upgrade your non-Bluetooth speakers, home stereo, or car stereo with this Bluetooth adapter to enjoy wireless audio from your smartphone, tablet, or laptop. Easy to set up and connect in seconds. Interface and Compatibility: Supports optical fiber/RCA/3.5mm/AUX/U disk audio, meeting the needs of various audio interface devices. Simple Setup: Pair this Bluetooth receiver with your phone or tablet and connect it to your non-Bluetooth speakers, home stereo, or car stereo via an audio cable to enjoy wireless music. Simple plug-and-play operation. Volume Control and Visual Indicators: Turn the knob to adjust the volume and press the less-than key to change music tracks. A readable screen displays the mode and volume, ensuring you're never confused. There is no battery in the Bluetooth adapter. Please connect the power source before use. Size: 90 x 77 x 30 mm. Material: ABS. Color: Black. Package Contents: 1 x Host. 1 x 3.5 Audio Cable. 1 x RCA Connector. 1 x Type-C Power Cable. Only the above package content is included; other products are not. Note: Light reflection and different displays may cause the color of the item in the picture to differ slightly from the real thing. The allowed measurement error is +/- 1-3 cm.